Method for Indicating Call Progress State, Conference Control Device, and Conference System

1. A method for indicating a call progress state in a conference system, the method comprising: obtaining multimedia indication information of a call progress state corresponding to a call request after sending the call request to a called terminal; and sending the multimedia indication information of the call progress state to at least one of: a management station of conference control device or a conference terminal; wherein sending the multimedia indication information of the call progress state comprises: mixing the multimedia indication information of the call progress state with other conference information to form mixed information, wherein mixing the multimedia indication information of the call progress state with other conference information further comprises at least one of: mixing voice indication information of the call progress state with conference voice data or mixing picture or video indication information of the call progress state with conference video information in a Picture-in-Picture mode; and sending the mixed information to at least one of: the management station of conference control device or the conference terminal.

2. The method according to claim 1 , wherein obtaining the multimedia indication information of the call progress state comprises: obtaining the multimedia indication information of the call progress state from the called terminal or a bearer network switch of the conference system.

3. The method according to claim 1 , wherein the call progress state represented by the multimedia indication information of the call progress state comprises one or more of the following states: call connecting, call failed, and call successful.

4. The method according to claim 1 , wherein the conference terminal comprises: other terminals, other conference participation terminals, and the called terminal.

5. A conference control device, comprising: a call request sending unit, configured to send a call request to a called terminal; a receiving unit, configured to receive multimedia indication information of a call progress state; and a multimedia indication information outputting unit, configured to send the multimedia indication information of the call progress state to at least one of: a management station of conference control device or a conference terminal; wherein the multimedia indication information outputting unit further comprises: a determining module, configured to determine whether to perform a mixing process on the received multimedia indication information of the call progress state; a mixing module, configured to mix the multimedia indication information of the call progress state with other conference information when the result of the determination indicates that a mixing process needs to be performed, wherein the mixing module is further configured to mix the multimedia indication information of the call progress state with the other conference information by at least one of: mixing voice indication information of the call progress state with conference voice data or mixing picture or video indication information of the call progress state with the conference video information in a Picture-in-Picture mode; and a sending module, configured to send information that is mixed by the mixing module to at least one of: the management station of conference control device or the conference terminal.

6. The conference control device according to claim 5 , wherein the conference control device is a multipoint control unit (MCU).

7. A conference system for indicating a call progress state, comprising: a conference control device, configured to send a call request, obtain multimedia indication information corresponding to the call request about a call progress state , and send the multimedia indication information of the call progress state; and at least one terminal, configured to receive the call request, and output a corresponding multimedia indication of a progress state according to the multimedia indication information of the call progress state sent by the conference control device; wherein the conference control device is further configured to: mix the multimedia indication information of the call progress state with other conference information if it is determined that a mixing process is required for the multimedia indication information of the call progress state, and send mixed information produced by the mixing process, wherein the conference control device is further configured to at least one of: mix voice indication information of the call progress state with conference voice data or mix picture or video indication information of the call progress state with the conference video information in a Picture-in-Picture mode.

8. The conference system according to claim 7 , further comprising a management station of conference control device, configured to output a corresponding multimedia indication of a progress state according to the multimedia indication information of the call progress state sent by the conference control device.

9. The conference system according to claim 7 , further comprising at least one switch that forms a bearer network of the conference system, wherein the switch is configured to generate multimedia indication information of a call progress state, and send the multimedia indication information of the call progress state to the conference control device.